A gun belt is built to take the weight and not roll over, droop or flex.
Most 'normal' belts are designed to look pretty first and hold up your pants, a little, second. They are not intended to carry anything heavier than a ring of keys or a cellphone.
Hang the weight of a gun and reload on one with regularity for any extended period of time and it will start failing to keep the gear hanging on it where you put it. First, you notice a decided droop in the belt right where the gun rides when the belt is laid out flat. That pulls on your pants ride so they ride lower in that spot. Lower the gun rides, the harder it is to hide. Then, it will start rolling away from the body at the top. Also bad because the further the gun butt wanders from the body, the more pronounced the bulge will be.
Been there, did that for years before I found a source for a belt designed to take the weight. Where the 'normal' belt comes from really doesn't matter much. Cheapo belts from Wally World or K Mart failed just like the more expensive ones from Macy's or Kohl's or the nice looking 'outdoorsy' ones from the sporting goods and outdoors places. The difference was just a matter of weeks.
When I finally got a 'real' gun belt, the difference was like day and night. Things stayed where I put them. I suddenly didn't have to pull up my pants- not even just one side- all the time any more. That little shimmy and shift that you have to do when you get out of the car was suddenly just habit instead of necessity.
